我将简要介绍我要实现的目标。我有一个Spring Boot应用程序,它是一个Eureka客户端,并将其注册为数据服务服务。在此应用程序启动之后(ApplicationReadeEvent.class),我还在注册另一个自定义创建的Eureka客户端,看来注册成功了。访问http://localhost:8761时,我可以看到该新注册的服务(工作流服务)。之所以决定在数据服务应用程序中执行此操作,是因为不需要该上下文,而仅在DEV环境中才需要它。后来代替它的是其他团队开发的真正的工作流服务。这里的问题是,当我尝试通过伪装的客户端访问此服务时,我收到异常:
com.netflix.client.ClientException: Load balancer does not have available server for client: workflow-service
这是我的自定义服务注册代码:
package XXX;
import com.netflix.appinfo.ApplicationInfoManager;
import com.netflix.appinfo.HealthCheckHandler;
import com.netflix.appinfo.InstanceInfo;
import com.netflix.discovery.DiscoveryClient;
import org.mockserver.integration.ClientAndServer;
import org.mockserver.model.HttpRequest;
import org.mockserver.model.HttpResponse;
import org.springframework.beans.factory.ObjectProvider;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnExpression;
import org.springframework.boot.context.event.ApplicationReadyEvent;
import org.springframework.cloud.commons.util.InetUtils;
import org.springframework.cloud.commons.util.InetUtilsProperties;
import org.springframework.cloud.netflix.eureka.*;
import org.springframework.cloud.netflix.eureka.serviceregistry.EurekaRegistration;
import org.springframework.cloud.netflix.eureka.serviceregistry.EurekaServiceRegistry;
import org.springframework.context.ApplicationContext;
import org.springframework.context.ApplicationEventPublisher;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.event.ContextClosedEvent;
import org.springframework.context.event.EventListener;
import java.net.SocketException;
@Configuration
@ConditionalOnExpression("${workflow.engine.mock.enabled:false}")
public class MockWorkflowEngineConfiguration {
@Value("${workflow.engine.mock.application.name}") private String workflowEngineApplicationName;
@Value("${workflow.engine.mock.application.port}") private Integer workflowEnginePort;
@Autowired private EurekaInstanceConfigBean originalInstanceConfig;
@Autowired private EurekaClientConfigBean originalClientConfig;
@Autowired private ApplicationInfoManager applicationInfoManager;
@Autowired private ApplicationContext applicationContext;
@Autowired private ApplicationEventPublisher applicationEventPublisher;
@Autowired private ObjectProvider<HealthCheckHandler> healthCheckHandler;
@Autowired private EurekaServiceRegistry eurekaServiceRegistry;
private EurekaRegistration workflowEngineEurekaRegistration;
private DiscoveryClient workflowEngineDiscoveryClient;
private ClientAndServer workflowEngineMockClient;
@EventListener(ApplicationReadyEvent.class)
public void initializeMockWorkflowEngine() throws SocketException{
workflowEngineDiscoveryClient = new CloudEurekaClient(
createWorkflowEngineAppInfoManager(),
duplicateEurekaClientConfig(),
applicationEventPublisher);
workflowEngineEurekaRegistration = EurekaRegistration.builder((CloudEurekaInstanceConfig) workflowEngineDiscoveryClient.getApplicationInfoManager().getEurekaInstanceConfig())
.with(workflowEngineDiscoveryClient)
.with(workflowEngineDiscoveryClient.getApplicationInfoManager())
.with(healthCheckHandler).build();
eurekaServiceRegistry.register(workflowEngineEurekaRegistration);
workflowEngineMockClient = new ClientAndServer(workflowEnginePort);
workflowEngineMockClient.when(
HttpRequest.request()
.withMethod("GET")
.withPath("/job")
)
.respond(
HttpResponse.response()
.withStatusCode(200)
.withBody("{ id: '1', name: 'default'}")
);
}
@EventListener(ContextClosedEvent.class)
public void shutdownMockWorkflowEngine(){
workflowEngineDiscoveryClient.shutdown();
eurekaServiceRegistry.deregister(workflowEngineEurekaRegistration);
workflowEngineMockClient.stop(true);
}
private ApplicationInfoManager createWorkflowEngineAppInfoManager() throws SocketException {
EurekaInstanceConfigBean newInstanceConfig =
new EurekaInstanceConfigBean(new InetUtils(new InetUtilsProperties()));
newInstanceConfig.setEnvironment(applicationContext.getEnvironment());
newInstanceConfig.setAppname(workflowEngineApplicationName);
newInstanceConfig.setInstanceId(applicationInfoManager.getInfo().getHostName() + ":" + workflowEngineApplicationName + ":" + workflowEnginePort);
newInstanceConfig.setInitialStatus(InstanceInfo.InstanceStatus.UP);
newInstanceConfig.setNonSecurePortEnabled(originalInstanceConfig.isNonSecurePortEnabled());
newInstanceConfig.setNonSecurePort(workflowEnginePort);
newInstanceConfig.setHostname(applicationInfoManager.getInfo().getHostName());
newInstanceConfig.setSecurePortEnabled(originalInstanceConfig.isSecurePortEnabled());
newInstanceConfig.setSecurePort(originalInstanceConfig.getSecurePort());
newInstanceConfig.setDataCenterInfo(originalInstanceConfig.getDataCenterInfo());
newInstanceConfig.setHealthCheckUrl(originalInstanceConfig.getHealthCheckUrl());
newInstanceConfig.setSecureHealthCheckUrl(originalInstanceConfig.getSecureHealthCheckUrl());
newInstanceConfig.setHomePageUrl(originalInstanceConfig.getHomePageUrl());
newInstanceConfig.setStatusPageUrl(originalInstanceConfig.getStatusPageUrl());
newInstanceConfig.setStatusPageUrlPath(originalInstanceConfig.getStatusPageUrlPath());
newInstanceConfig.setIpAddress(originalInstanceConfig.getIpAddress());
newInstanceConfig.setPreferIpAddress(originalInstanceConfig.isPreferIpAddress());
ApplicationInfoManager manager =
new ApplicationInfoManager(newInstanceConfig, (ApplicationInfoManager.OptionalArgs) null);
return manager;
}
private EurekaClientConfigBean duplicateEurekaClientConfig() {
EurekaClientConfigBean newConfig = new EurekaClientConfigBean();
newConfig.setFetchRegistry(false);
newConfig.setEurekaServerPort(originalClientConfig.getEurekaServerPort());
newConfig.setAllowRedirects(originalClientConfig.isAllowRedirects());
newConfig.setAvailabilityZones(originalClientConfig.getAvailabilityZones());
newConfig.setBackupRegistryImpl(originalClientConfig.getBackupRegistryImpl());
newConfig.setServiceUrl(originalClientConfig.getServiceUrl());
return newConfig;
}
}
这是我的假客户代码:
@FeignClient(name = "workflow-service", configuration = FeignClientConfiguration.class)
public interface WorkflowService {
@RequestMapping(value = "/job", method = RequestMethod.GET, consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE)
ResponseEntity<List<WorkflowJobDTO>> listJobs();
这是我试图通过其访问其他服务的虚假客户端用法:
@GetMapping(path = "/workflow-jobs", produces = "application/json")
public ResponseEntity<List<WorkflowJobDTO>> getAllJobs() {
return workflowService.listJobs();
}
}
仅通过设置虚拟主机名已解决。
newInstanceConfig.setVirtualHostname(workflowEngineApplicationName);